The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 21, 1985
Filed:
Apr. 15, 1983
Applicant:
Inventors:
George C Johnston, Clinton, NC (US);
Michael A Swieboda, Hickory Hills, IL (US);
Assignee:
International Jensen Incorporated, Schiller Park, IL (US);
Primary Examiner:
Int. Cl.
CPC ...
D04H / ;
U.S. Cl.
CPC ...
428172 ; 181167 ; 181169 ; 181170 ; 428288 ; 428296 ; 264119 ; 264122 ; 264126 ;
Abstract
A loudspeaker diaphragm is disclosed which is formed of a slurry of cellulose fibers and polypropylene fibers. In the fabrication of the diaphragm, a felt is made of the slurry, and the felt is subjected to sufficient heat and pressure to fuse the polypropylene fibers together to form a skeleton or matrix which extends through the felt.
Johnston, George. (1985). Loudspeaker diaphragm and method for making same (U.S. Patent No. 4518642). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/4518642
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile